Wow Tom! That's a serious bit of electronics information and will take me a few read throughs to fully understand (after reading it twice, I think I get the gist though). I think the take home message for future projects boils down to using a shorter umbilical with separate conductors for every ground. Thanks for taking the time to explain that.

Hi,
You do not need to have an scope to check if a DC power supply have ripples. Use a voltmeter in AC and read the voltage. The reading should be almost zero is you do not have ripples. The only time that you will have a reading of zero is when your are reading a voltage from a battery. That is what you call pure DC. In a good power supply some millivolts would be find. The lower the reading the better is the power filtering filtering.

Hi,
You do not need to have an scope to check if a DC power supply have ripples. Use a voltmeter in AC and read the voltage. The reading should be almost zero is you do not have ripples. The only time that you will have a reading of zero is when your are reading a voltage from a battery. That is what you call pure DC. In a good power supply some millivolts would be find. The lower the reading the better is the power filtering filtering.

Your 100% right, you forgot about that when you have a good scope around